Coating method, coating device, and functional film production method
AssigneeSumitomo Chemical Company, Limited
InventorsRyutaro Shiba, Yasutoshi Minemoto
Life of this patent
Estimating the term…
Abstract
A film is uniformly coated with a coating solution. The following formula is satisfied: 0<a×c/b<113 where (i) a is a diameter (mm) of a gravure roll, (ii) b is a ratio of a circumferential velocity of the gravure roll to a conveyance speed at which the film is conveyed, and (iii) c is a volume (mL/m2) of recesses of the gravure roll, which volume is measured per unit area of a circumferential surface of the gravure roll.
Claims7
A reverse gravure coating method of coating a battery separator comprising transferring a coating solution from a gravure roll to the battery separator, wherein the following formula is satisfied:
- 0<a×c/b<113
- where (i) a is a diameter (mm) of the gravure roll, (ii) b is a ratio on a % basis of a circumferential velocity of the gravure roll to a conveyance speed, d (m/min), at which the battery separator is conveyed, wherein the following formula is satisfied:
- b=0.001×a×π×B/d
- Where B (rpm) is a rotational speed of the gravure roll, and (iii) c is a volume (mL/m2) of recesses of the gravure roll, which volume is measured per unit area of a circumferential surface of the gravure roll;
- wherein 10 mL/m2≤c≤120 mL/m2.
Dependencies are inferred from the claim text.